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Appendix 4 Overview of Condition Monitoring Techniques and Potential-Failure Interval Data
90 ABS GUIDE FOR SURVEY BASED ON RELIABILITY-CENTERED MAINTENANCE . 2003
TABLE 5 (continued)Nondestructive Testing
Condition Condition MonitoringSubcategory
Technique Fixed/Portable Equipment
P-F Interval
Skill
Surface andshallowsubsurfacedefectsTube thicknessWearStrainCorrosionMetalthickness lossdue to wearand/or
corrosion
Eddy CurrentTesting Eddy Current Testing Portable Weeks
Trained andexperienced technician
PlasticdeformationCrackformationFatigueStressWear
Acoustic Emission Acoustic Emission Portable Weeks Trained andexperienced technician
Defects in pressure boundary
Hydrostatic Testing Hydrostatic Testing Portable Days Trained skilled worker
Surface cracks
Oxide filmsCorrosionWearFatigueWeld defects
Visual Inspection -Borescope/Endoscope/Fiberscope
Visual Inspection -Borescope/Endoscope/Fiberscope
Portable Weeks Trained andexperienced technician
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Appendix 4 Overview of Condition Monitoring Techniques and Potential-Failure Interval Data
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TABLE 6 (continued)Electrical Condition Monitoring 1
Condition Condition MonitoringSubcategory
Technique Fixed/Portable Equipment
P-F Interval Skill
Broken rotor barsBroken shortingringsHigh resistance
between barsand ringsUneven rotor-stator gapRotormispositionRotor
deteriorationRotor shorted
Motor CircuitAnalysis Motor Circuit Analysis Portable
Weeks tomonths
Experienced electricaltechnician to performthe test
Battery celldeterioration
BatteryImpedanceTesting
Battery Impedance Testing Portable WeeksExperienced electricaltechnician to performthe test
Notes:1 Refer to Appendix 4, Table 2 Thermography for additional condition-monitoring techniques related to electrical
equipment.
2 This test stresses the insulation systems and can induce premature failure in marginal motors. This test is notrecommended as a routinely repeated condition-monitoring technique, but as an acceptance test.
TABLE 7Performance Monitoring
Condition Condition MonitoringSubcategory
Technique Fixed/Portable Equipment
P-F Interval Skill
Heat transferdeterioration Temperature
Monitoring Temperature Monitoring Fixed/PortableDays toweeks
Trained semi-skilledworkerPerformance
deterioration
Performance
deteriorationFlow Monitoring Flow Monitoring Fixed/Portable Days to
weeks
Trained semi-skilled
workerPerformancedeterioration Pressure
monitoring Pressure monitoring Fixed/PortableDays toweeks
Trained semi-skilledworkerLeaks
Plugging
Power output Power output Power meter (torque meter) Fixed/Portable Days toweeks Trained skilled worker
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Appendix 4 Overview of Condition Monitoring Techniques and Potential-Failure Interval Data
TABLE 8Suggested P-F Intervals
Equipment Item
Controls Test Interval
Failure per 10 4 hrs Months
Main Engine 0.5570 4.3Boiler 0.0137 175.2
Diesel Generator 0.0920 26.1
Steam Turbo Generator 0.0020 1200.0